Rename rtc_instrumentation_test_apk targets to end with _test_apk.

This matches Chromium pattern of naming instrumentation test apks with
a name ending in _test_apk. The old naming confuses generate_gradle.py.

Renames:
 - AppRTCMobileTest
   -> AppRTCMobile_test_apk
 - AppRTCMobileTestStubbedVideoIO
   -> AppRTCMobile_stubbed_video_io_test_apk
 - libjingle_peerconnection_android_unittest
   -> android_instrumentation_test_apk

Bug: webrtc:9588
TBR: phoglund
Change-Id: Idb82dc4bd089bc7c90e9373f7c3d572f9fd2d95a
Reviewed-on: https://webrtc-review.googlesource.com/92380
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24184}
diff --git a/BUILD.gn b/BUILD.gn
index 3f07fdb..b216cb8 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -67,7 +67,7 @@
       if (is_android) {
         deps += [
           ":android_junit_tests",
-          "sdk/android:libjingle_peerconnection_android_unittest",
+          "sdk/android:android_instrumentation_test_apk",
         ]
       } else {
         deps += [ "modules/video_capture:video_capture_tests" ]